I have a 2017 da board.
I combined it with a "Slingshot - Hover Glide NF2" because the shop had it available with a shorter learner mast option for an ok price.
Can't really comment on the foiling since I used a different foil but I did try out the surfboard on a lake a few times.
Disclaimer: I have no other directional board experience.
This is my limited experience, used it about 3 short sessions without the foil and about 8 times with the foil.
Rode the board on flat water:
* To me the board feels very similar to a large single direction twintip.
You can put in a bit more front foot pressure if you want but its not super different from a twintip.
* I still have to learn transitions and I am guessing that is a bit harder on this board compared to a real surf board.
This is because you will sink the board when you have no speed. (the board has no volume/buoyancy to speak of).
* If you remove the foil from the board you have 4 gaping holes in the board which will spray up water.
It comes with some plastics to close them up but I found them to be a hassle and just ignored the spray.
* I am to lazy to remove the surf fins when putting on the foil so that looks a bit weird when foiling